TC1784
System Control Unit (SCU)
User´s Manual
3-26
V1.1, 2011-05
32-bit SCU, V1.18
Figure 3-14 EXTCLK0 Generation
Overview
The fractional divider makes it possible to generate a external clock from the FPI-Bus
clock using a programmable divider. The fractional divider divides the input clock
f
FPI
either by the factor 1/n or by a fraction of n/1024 for any value of n from 0 to 1023. This
clock is thereafter divider additionally by a factor of two to guarantee a 50% duty cycle
and outputs the clock,
f
OUT
. The fractional divider is controlled by the FDR register.
shows the fractional divider block diagram.
The adder logic of the fractional divider can be configured for two operating modes:
•
Reload counter (addition of +1), generating an output clock pulse on counter overflow
•
Adder that adds a STEP value to the RESULT value and generates an output clock
pulse on counter overflow
extclk .
EXTCON.EN0
f
MA
M
U
X
P1.12
EXTCON.SEL0
f
OUT
to
GPTA
[IN0]
f
FPI
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
P2.8
MUX
EXTCON.
GPTAINSEL
f
OSC
Fractional
Divider
FDR
f
MT
ERAY
MT
f
PLL _ERAY
Содержание TC1784
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